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Lit., "And they say, 'Obedience'" - a reference to the hypocrites of Medina, in the time of the Prophet, and - by implication - the hypocritical "admirers" and half-hearted followers of Islam at all times.
I.e., they surreptitiously try to corrupt the message of God's Apostle. The verb bata denotes "he spent the night"; in the form bayyata it signifies "he meditated by night [upon something, or upon doing something]", or "he devised [something] by night" (Lisan al-'Arab), i.e., in secrecy, which is symbolized by "the dark of night".
If we trust people who are not true, they are more likely to hinder than to help. But Allah is All-good as well as All-powerful, and all our affairs are best entrusted to His care. He is the best Guardian of all interests. Therefore we should not trust the lip professions of Hypocrites, but trust in Allah. Nor should our confidence in Allah be shaken by any secret plots that enemies hatch against us. We should take all human precautions against them, but having done so, we should put our trust in Allah, Who knows the inner working of events better than any human mind can conceive.